This is quick guide howto delete/remove/clean old kernels on Fedora 28/27/26, CentOS 7.5/6.10, Red Hat (RHEL) 7.5/6.10. I use here two kernel as example, if you want to keep other more or less, then adjust amount of installed kernels as you wish. Normally reason why you maybe want remove kernels is limited disk space, example on VPS servers and laptop. This is very easy task.
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1. Check Installed Kernels and All Kernel Packages
rpm -qa kernel\* |sort...

Quick guide, howto remove and disable YUM/DNF repo (repository). Yum/DNF command itself does not contain any way to remove the repository. YUM and DNF repo files are located in /etc/yum.repos.d/ directory.
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I use skype-stable.repo file with following content as example on this guide:
[skype-stable]
name=skype (stable)
baseurl=https://repo.skype.com/rpm/stable/
enabled=1
gpgcheck=1
gpgkey=https://repo.skype.com/data/SKYPE-GPG-KEY
Remove YUM/DNF Repo...

This is quick tip, howto use Bash auto complete (autocomplete) with DNF/YUM (package names/commands) on Fedora, CentOS, Red Hat (RHEL). Dnf package manager is used on Fedora 26/25/24/23/22 and Yum package manager is used on Fedora 21/20/19/18, CentOS 7.3/6.9 and Red Hat (RHEL) 7.3/6.9.
Autocomplete feature is familiar to many who have used the Debian based Linux, like Debian and Ubuntu. For some reason, this feature is not automatically activated/installed on Red Hat -based Linux distros,...

This is a quick tip, howto find, query and list all available packages from a specific Yum repository/repositories on Fedora, CentOS, Red Hat (RHEL). This trick does not show the already installed packages from selected repository.
List All Repositories and Check Repository ID's
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Yum (Yellowdog Update Modified) is RPM Packet Management system for Fedora, CentOS, Red Hat, OpenSuse etc. Yum history (list, info, summary, repeat, redo, undo, new) commands is added on 3.2.25 version. So this works every Linux Distros, which uses yum 3.2.25 or newer. Yum history command is a really useful in situations where the need to example rollback latest yum activity or undelete some deletes or just see what is updated lately.
Yum history and Yum history list
yum history lists...

Updated 26.2.2010, Read First
Currently, the latest version of the KDE desktop in Fedora is 4.3.5. I had some problems with its stability, so I decided to try out, how will work KDE 4.4.0 the latest stable version of KDE. At first I tried to install KDE 4.4 from Rawhide repository, but it failed to install from there. Here is instructions on how to install KDE 4.4 successfully using RPMFusion and KDE Packaging Project Repositories. It may be that RPMFusion repository is redundant, but KDE...

What is Gnome Do?
GNOME Do (Do) is an intelligent launcher tool that allows users to use the keyboard to rapidly perform tasks such as launching applications, manipulating files and data, running scripts, or sending e-mail. It is similar to the applications GNOME Launch Box (Linux Gnome), KRunner (Linux KDE), Quicksilver (Mac OS X), LaunchBar (Mac OS X) and Butler (Mac OS X).
What is Gnome Do - Docky?
Gnome Do - Docky is a nice frontend for GNOME Do (Do) which introduces an entirely new...

This is quick tip, howto downgrade packages using YUM (example) on Fedora, CentOS, Red Hat (RHEL). This works simply with yum downgrade command and is very usefull when package(s) downgrade is needed some reason.
YUM Downgrade Basic Usage
Downgrade is very straightforward when package have not any dependencies, which affect the downgrade.
YUM Downgrade Single Package
yum downgrade package
Example:
yum downgrade hunspell-mr.noarch
Setting up Downgrade...